Research on Replica Strategy in Cloud Storage System

Most cloud storage system uses replica technology to ensure data reliability and improve data access efficiency. But in current file system, there are some problems such as the fixed number of replica and replica placement may cause load imbalance. In order to solve these problems, introducing a dynamic replica adjustment strategy and replica placement algorithm, this strategy can dynamic adjust the number of replica along with the change of heat of access and access response time. When placing a replica, in order to make the access efficiency is the highest, propose a replica placement algorithm based on transmission cost, which is select the best place of access efficient is most in placement a replica. Finally, experimental results show the effectiveness of the strategy.